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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d79f87a419f2cdaa35317b988cf13102449220249c17f9284971a8d57fda38' 
  AND token = 'O6iqdoeei0hUeL/hIvZUlCOT+vxAC5i7IWmtyQvZ0lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}